1880 Liberty Seated Dime. Proof-68 (NGC).A virtually pristine specimen, both sides exhibit swirls of bright pink, pale gold and powder blue iridescence to otherwise dominant charcoal-steel patina. Highly reflective in finish, it is difficult for us to imagine a more inviting survivor from this low mintage date in the Liberty Seated dime series, one with a generous Proof mintage of 1,355 pieces, but only 36,000 circulation strikes produced.